diff options
| author | Chunyan Zhang <zhang.chunyan@linaro.org> | 2018-08-30 10:21:41 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-10-08 11:40:43 +0200 |
| commit | e65953d4a117a6e1d8a7abf9b59c0968da95dd6b (patch) | |
| tree | 06c6e1663a122f69f63956689d96b8957380ff13 /drivers/mmc/host/sdhci.c | |
| parent | mmc: sdhci: Add ADMA2 64-bit addressing support for V4 mode (diff) | |
| download | linux-e65953d4a117a6e1d8a7abf9b59c0968da95dd6b.tar.xz linux-e65953d4a117a6e1d8a7abf9b59c0968da95dd6b.zip | |
mmc: sdhci: Add 32-bit block count support for v4 mode
Host Controller Version 4.10 re-defines SDMA System Address register
as 32-bit Block Count for v4 mode, and SDMA uses ADMA System
Address register (05Fh-058h) instead if v4 mode is enabled. Also
when using 32-bit block count, 16-bit block count register need
to be set to zero.
Since using 32-bit Block Count would cause problems for auto-cmd23,
it can be chosen via host->quirk2.
Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/sdhci.c')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 63bc74ae2f66..bd6426036c89 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1082,7 +1082,19 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) /* Set the DMA boundary value and block size */ sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, data->blksz), SDHCI_BLOCK_SIZE); - sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT); + + /* + * For Version 4.10 onwards, if v4 mode is enabled, 32-bit Block Count + * can be supported, in that case 16-bit block count register must be 0. + */ + if (host->version >= SDHCI_SPEC_410 && host->v4_mode && + (host->quirks2 & SDHCI_QUIRK2_USE_32BIT_BLK_CNT)) { + if (sdhci_readw(host, SDHCI_BLOCK_COUNT)) + sdhci_writew(host, 0, SDHCI_BLOCK_COUNT); + sdhci_writew(host, data->blocks, SDHCI_32BIT_BLK_CNT); + } else { + sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT); + } } static inline bool sdhci_auto_cmd12(struct sdhci_host *host, |